Two genes are linked on the same chromosome, 20 cM apart. A plant has the genotype Ab/aB (the dominant alleles are on different homologues). It is selfed, and there is no difference in the survival of gametes or zygotes. What fraction of the offspring is expected to show both recessive traits (aabb)?

BiologyAdvancedHigh School (11–12)Heredity and Evolution › Heredity and Inheritance Olympiad

Two genes are linked on the same chromosome, $20\ \text{cM}$ apart. A plant has the genotype $\dfrac{Ab}{aB}$ (the dominant alleles are on different homologues). It is selfed, and there is no difference in the survival of gametes or zygotes. What fraction of the offspring is expected to show both recessive traits ( $aabb$ )?

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← In a large randomly mating population the frequency of a recessive allele a is 0.20. The genotype aa has a relative fitness of 0.50, and AA and Aa both have a relative fitness of 1. Selection acts once, before the adults breed. What is the frequency of a among the gametes that make the next generation?Three linked genes lie in the order P, Q, R. The map distance from P to Q is 10 cM and from Q to R is 20 cM. The interference between the two regions is 0.4. A heterozygote PQR/pqr is test crossed and 5000 progeny are counted. How many progeny are expected to be of the two parental types together? →

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